UVa: 12505 (Robot Instructions)



// http://uva.onlinejudge.org/external/125/12503.html
// Runtime: 0.008s
// Tag: adhoc, string

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream>
#include <cmath>
#include <bitset>
#include <utility>
#include <set>
#include <numeric>
#include <ctime>

#define Inf 2147483647
#define Pi acos(-1.0)
#define N 50000
#define LL long long

inline LL Power(int b, int p) { LL ret = 1; for ( int i = 1; i <= p; i++ ) ret *= b; return ret; }
const int dr [] = {-1, -1, 0, 1, 1, 1, 0, -1};
const int dc [] = {0, 1, 1, 1, 0, -1, -1, -1};

#define F(i, a, b) for( int i = (a); i < (b); i++ )
#define Fs(i, sz) for( size_t i = 0; i < sz.size (); i++ )
#define Fe(i, x) for(typeof (x.begin()) i = x.begin(); i != x.end (); i++)
#define Set(a, s) memset(a, s, sizeof (a))
#define max(a, b)  (a < b ? b : a)
#define min(a, b)  (a > b ? b : a)

using namespace std;

char instructions [100 + 10];

int main () 
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);

	int testCases; scanf ("%d", &testCases);

	while ( testCases-- ) {
		int n; scanf ("%d", &n); getchar ();

		int ret = 0;
		char input [100];
		char garbage [100];
		int val;

		for ( int i = 1; i <= n; i++ ) {
			gets (input);

			if ( strcmp (input, "LEFT") == 0 ) {
				instructions [i] = 'L';
				ret--;
			} else if ( strcmp (input, "RIGHT") == 0 ) {
				instructions [i] = 'R';
				ret++;
			} else {
				sscanf (input, "%s %s %d", garbage, garbage, &val);
				if ( instructions [val] == 'L' ) ret--;
				else ret++;
				instructions [i] = instructions [val];
			}
		}

		printf ("%d\n", ret);
	}

	return 0;
}

// @END_OF_SOURCE_CODE
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